This article is about the consumable item affecting the player's mood. For books that increase experience gain, see Skill Books.

A book is an item designed to relieve unhappiness, stress and boredom when the player character is seriously struggling with the Knox Event. Unlike skill books, these books are 'consumed' once they're read, and therefore are removed from the player's inventory. A book can also be used as a fuel for particular heat sources, and lasts for 15 minutes if done so.